After that, start tpfan-admin and adjust the settings (by clicking on the sensor's graph). You should split the graph (via context menu) and set the fan to full-speed when the sensor reaches, say, 65 °C. You may also edit the config file directly.

TLP

Frequency Scaling

Undervolting

Undervolting it not possible with the intel core iX cpu.

Bootloader kernel options

Add these kernel options to your bootloader's config file to make use of power saving mechanismens which are turned off by default because of reported instabilities. For me, they do a great job on my X201.

Warning: These options can cause instability on your system! Try them and remove them if you are experiencing problems.